9
 0   0  0  0   8.0
 1  -1  0  0  -1.0
 2   1  0  0  -1.0
 3   0 -1  0  -1.0
 4   0  1  0  -1.0
 5  -1 -1  0  -1.0
 6   1 -1  0  -1.0
 7  -1  1  0  -1.0
 8   1  1  0  -1.0
